Problem: there is no spellchecking

[eviau-artefactual]

Version of the documentation

1.16 and before

Page (and section, if applicable) where the issue occurs

The documentation in general.

Description of the issue

There is not spellchecking that is set up for the documentation.

Suggested fix

Enable spellchecking through GitHub Actions and a relevant Sphinx extension.

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For Artefactual use:

Before you close this issue, you must check off the following:

• All pull requests related to this issue are properly linked
• All pull requests related to this issue have been merged
• Details about this issue have been added to the release notes (if applicable)

[eviau-artefactual]

Suggestion for a sphinx extension: https://sphinxcontrib-spelling.readthedocs.io - the previous PRs make use of it.

[eviau-artefactual]

For the record: this is more or less the same process as in artefactual/atom-docs#257